TWI751230B - High vertical dielectric liquid crystal composition and liquid crystal display element - Google Patents

Abstract

The invention discloses a liquid crystal composition comprising one or more compounds represented by formula I, one or more compounds represented by formula II and one or more compounds represented by formula III,

具有良好的對光和熱的穩定性，較低的黏度，可以藉由調節單體比例得到較為寬泛的折射率、較高的清晰點(很寬的使用溫度範圍)，尤其是液晶組合物具有較高的光的穿透率，因而顯示元件具有較高的亮度或是具有節能省電的效果。

It has good stability to light and heat, low viscosity, and can obtain a wider refractive index and a higher clear point (a wide range of use temperature) by adjusting the monomer ratio, especially the liquid crystal composition has The higher the transmittance of light, the higher the brightness of the display element or the effect of energy saving.

Description

High vertical dielectric liquid crystal composition and liquid crystal display element

The invention belongs to the technical field of liquid crystal materials, and in particular relates to a high vertical dielectric liquid crystal composition and a liquid crystal display element containing such liquid crystals.

At present, the application range of liquid crystal compounds is expanding more and more widely, and it can be applied to various types of displays, optoelectronic components, sensors, and the like. There are many kinds of liquid crystal compounds used in the above-mentioned display field, among which nematic liquid crystal is the most widely used. Nematic liquid crystals have been used in passive TN, STN matrix displays and systems with TFT active matrices.

For the application field of thin film transistor technology (TFT-LCD), although the market has been very large and the technology has gradually matured in recent years, people's requirements for display technology are also constantly improving, especially in the realization of fast response, reducing the driving voltage to reduce power consumption, etc. As one of the important optoelectronic materials of liquid crystal display, liquid crystal material plays an important role in improving the performance of liquid crystal display.

As a liquid crystal material, it is required to have good chemical and thermal stability and stability to electric fields and electromagnetic radiation. As a liquid crystal material for thin film transistor technology (TFT-LCD), it not only needs to have the above stability, but also has a wide nematic temperature range, suitable birefringence anisotropy, very high resistivity, good UV resistance, high charge retention and low vapor pressure.

For the application of dynamic image display, to eliminate the afterimage and tailing of the display image, the liquid crystal is required to have a fast response speed, so the liquid crystal is required to have a low rotational viscosity γ1. In addition, for portable devices In order to reduce the power consumption of the device, it is hoped that the driving voltage of the liquid crystal is as low as possible. For displays such as televisions, the driving voltage requirements for liquid crystals are not so low.

The viscosity of the liquid crystal compound, especially the rotational viscosity γ1, directly affects the response time of the liquid crystal after power-on. Whether it is the rise time (t _on ) or the fall time (t _off ), it is proportional to the rotational viscosity γ1 of the liquid crystal, and the rise time ( t _on ) is related to the liquid crystal cell and the driving voltage, and can be adjusted by increasing the driving voltage and reducing the thickness of the liquid crystal cell. The fall time (t _off ) has nothing to do with the driving voltage, but is mainly related to the elastic constant of the liquid crystal and the cell thickness of the liquid crystal cell. The thinning of the cell thickness will reduce the fall time (t _off ), and under different display modes, the movement of the liquid crystal molecules The methods are different. The three modes of TN, IPS, and VA are inversely proportional to the average elastic constant K, torsional elastic constant, and bending elastic constant, respectively.

According to the liquid crystal continuum theory, after various liquid crystals are deformed under the action of external force (electric field, magnetic field), they will "rebound" back to their original shape through the interaction between molecules. Similarly, liquid crystals form "viscosity" due to intermolecular interactions. Small changes in liquid crystal molecules will cause significant changes in the conventional parameters and performance of liquid crystals. Some of these changes have certain rules, and some of these changes seem to be difficult to find. They will also have a significant impact on the interaction between liquid crystal molecules. These effects are very important. Subtle, so far there is no perfect theoretical explanation.

The viscosity of liquid crystal is related to the molecular structure of liquid crystal. It is one of the important tasks of liquid crystal formulation engineers to study the relationship between the viscosity of liquid crystal system formed by different liquid crystal molecules and the molecular structure of liquid crystal.

The reason for the high energy consumption of LCD panels is that only about 5% of the backlight can penetrate the display elements, and most of the light is "wasted" when captured by the human eye. If a liquid crystal with high light transmittance can be developed, the intensity of the backlight can be reduced, thereby achieving the purpose of saving energy and prolonging the use time of the device.

The technical problem to be solved by the present invention is to provide a liquid crystal composition with good stability to light and heat, low viscosity, and a relatively broad refractive index and a high sharpness point (very high clarity) can be obtained by adjusting the monomer ratio. Wide use temperature range), especially the liquid crystal composition has higher light transmittance, so the display element has higher brightness or has the effect of energy saving.

In order to solve the above technical problems, the present invention provides a liquid crystal composition, comprising one or more compounds represented by formula I, one or more compounds represented by formula II, and one or more compounds represented by formula III:

、

各自獨立地表示

、

、

、

、

、

或任意氟代苯中的一種或多種；

、

各自獨立地表示苯或氟代苯中的一種或兩種；

表示

、

、

或任意氟代苯中的一種或多種； m、p、w各自獨立地表示1、2或3； n、q各自獨立地表示0或1。 wherein R ₁ , R ₂ , R ₃ , R ₅ , and R ₆ each independently represent an alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, or an alkyl group having 2-10 carbon atoms. alkenyl group or alkenyloxy group with 3-8 carbon atoms, and any one or more unconnected CH _{2 in the groups represented by R 1} and R ₃ can be replaced by cyclopentyl, cyclobutyl, cyclopentyl Propyl, -O- substitution; R ₄ represents F, CF ₃ , OCF ₃ , OCHF ₂ or OCH ₂ F;

,

represent independently

,

,

,

,

,

or one or more of any fluorobenzene;

,

Each independently represents one or both of benzene or fluorobenzene;

Express

,

,

Or one or more of any fluorobenzene; m, p, w each independently represent 1, 2 or 3; n, q each independently represent 0 or 1.

The one or more compounds represented by the formula I are preferably one or more compounds among the compounds represented by the formulas I1 to I14; the one or more compounds represented by the formula II are preferably one of the compounds represented by the formulas II1 to II14 or more compounds; the one or more compounds shown in formula III are preferably one or more compounds in the compounds shown in formula III1 to III5,

Wherein, R ₁₁ and R ₃₁ each independently represent an alkyl group having 1-6 carbon atoms; R ₂₁ each independently represent an alkyl group having 1-5 carbon atoms; R ₅₁ and R ₆₁ each independently represent a carbon atom An alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, an alkenyl group having 2-6 carbon atoms, or an alkenyloxy group having 3-6 carbon atoms.

In the liquid crystal composition of the present invention, the total mass percentage content of the one or more compounds represented by formula I is preferably 1-40%, and the total mass percentage content of the one or more compounds represented by formula II is preferably 1-40% , the total mass percentage content of the one or more compounds represented by formula III is preferably 1-80%.

The compound represented by formula I also has relatively large dielectric anisotropy in the direction parallel to the long axis and the vertical direction of the liquid crystal molecules, while the difference (Δε) in the dielectric anisotropy in the direction parallel to the long axis and the vertical direction is small. The compound represented by the formula II has a large dielectric in the parallel direction and the vertical direction of the long axis of the liquid crystal molecule at the same time. Anisotropy, the difference (Δε) of dielectric anisotropy between the long axis parallel direction and the vertical direction is large. The combination of the two can obviously improve the dielectric anisotropy of the mixed liquid crystal in the vertical direction without making the Δε of the mixed liquid crystal smaller, so the addition amount will not be limited by Δε, and a larger amount can be achieved. The addition of , thereby greatly improving the transmittance of the liquid crystal mixture. The compound of formula III has low rotational viscosity, and further has a relatively high clear point (CP). When used in combination with the compounds represented by formula I and formula II, the liquid crystal mixture has low rotational viscosity and fast response speed.

其中，R₇表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基、氟取代的碳原子數為2-10的鏈烯基、碳原子數為3-8的鏈烯氧基或氟取代的碳原子數為3-8的鏈烯氧基；且所示R₇所述基團中任意一個或多個CH₂可以被環戊基、環丁基或環丙基替代；

、

、

各自獨立地表示：

、

、

、

、

、

、

及/或

中的一種 或多種；r表示0、1、2或3；Z₁、Z₂各自獨立地表示單鍵、-CF₂O-、-CH₂CH₂-或-CH₂O-； Y₂表示F、氟取代的碳原子數為1-5的烷基、氟取代的碳原子數為1-5的烷氧基、氟取代的碳原子數為2-5的鏈烯基或氟取代的碳原子數為3-8的鏈烯氧基。 The liquid crystal composition provided by the present invention may further comprise one or more compounds represented by formula IV

Wherein, R ₇ represents an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted alkyl group with 1 carbon atoms -10 alkoxy group, carbon number 2-10 alkenyl group, fluorine-substituted carbon number 2-10 alkenyl group, carbon number 3-8 alkenyl group or fluorine-substituted alkenyl group Alkenyloxy with 3-8 carbon atoms; and any one or more CH _{2 in the groups described in R 7} can be replaced by cyclopentyl, cyclobutyl or cyclopropyl;

,

,

independently represent:

,

,

,

,

,

,

and/or

One or more of; r represents 0, ₁ , 2 or 3; Z 1 and Z ₂ each independently represent a single bond, -CF ₂ O-, -CH ₂ CH ₂ - or -CH ₂ O-; Y ₂ represents F. Fluorine-substituted alkyl with 1-5 carbon atoms, fluorine-substituted alkoxy with 1-5 carbon atoms, fluorine-substituted alkenyl with 2-5 carbon atoms or fluorine-substituted carbon Alkenyloxy having 3-8 atoms.

The one or more compounds shown in formula IV are preferably IV0 to IV25 compounds

Wherein, X ₁ and X ₂ each independently represent H or F; R ₇ each independently represents an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, and a carbon number of 1-10 alkoxy, fluorine-substituted alkoxy with 1-10 carbon atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, carbon atoms, substituted carbon atoms, an alkenyloxy group or a 3-8-fluoro-3-8 alkenyloxy group, and the group represented by R7 is any one or more CH ₂ groups may be cyclopentyl, Cyclobutyl or cyclopropyl substitution; (F) each independently represents H or F.

The compound represented by formula IV has a large dielectric anisotropy (Δε), and the addition of an appropriate amount is beneficial to increase the dielectric anisotropy (Δε) of the mixed liquid crystal and reduce the driving voltage of the liquid crystal. It is suitable for use in positive TN, IPS, and FFS modes, and can also be used in PSA-positive TN, IPS, and FFS modes.

The addition amount of the compound represented by formula IV is preferably between 0-60%, more preferably 5-30%.

其中，R₈、R₉各自獨立地表示碳原子數為1-10的烷基、氟、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基、氟取代的碳原子數為2-10的鏈烯基、碳原子數為3-8的鏈烯氧基或氟取代的碳原子數為3-8的鏈烯氧基，且R₈、R₉所示基團中任意一個或多個CH₂可以被環戊基、環丁基或環丙基替代；Z₃、Z₄各自獨立地表示單鍵、-CH₂CH₂-或CH₂O-；

、

各自獨立地表示

、

、

、

、

、

、

及/或

中的一種或多種； m表示1、2或3；n表示0或1。 The liquid crystal composition may further comprise one or more compounds represented by formula V

wherein R ₈ and R ₉ each independently represent an alkyl group having 1-10 carbon atoms, fluorine, a fluorine-substituted alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, Fluorine-substituted alkoxy with 1-10 carbon atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and 3-8 carbon atoms Alkenyloxy or fluorine-substituted alkenyloxy with 3-8 carbon atoms, and any one or more CH _{2 in the groups represented by R 8} and R ₉ may be cyclopentyl, cyclobutyl or cyclopentyl propyl group is replaced; Z ₃ and Z ₄ each independently represent a single bond, -CH ₂ CH ₂ - or CH ₂ O-;

,

represent independently

,

,

,

,

,

,

and/or

One or more of; m represents 1, 2 or 3; n represents 0 or 1.

The one or more compounds represented by formula V are preferably V1 to V11 compounds

其中，R₈、R₉各自獨立地表示碳原子數為1-10的烷基、氟、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基、氟取代的碳原子數為2-10的鏈烯基、碳原子數為3-8的鏈烯氧基或氟取代的碳原子數為3-8的鏈烯氧基，且R₈、R₉所示基團中任意一個或多個CH₂可以被環戊基、環丁基或環丙基替代。

wherein R ₈ and R ₉ each independently represent an alkyl group having 1-10 carbon atoms, fluorine, a fluorine-substituted alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, Fluorine-substituted alkoxy with 1-10 carbon atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and 3-8 carbon atoms Alkenyloxy or fluorine-substituted alkenyloxy with 3-8 carbon atoms, and any one or more CH _{2 in the groups represented by R 8} and R ₉ may be cyclopentyl, cyclobutyl or cyclopentyl Propyl substitution.

其中，R₁₀、R₁₁各自獨立地表示碳原子數為1-10的烷基、氟取代的碳原子數為1-10的烷基、碳原子數為1-10的烷氧基、氟取代的碳原子數為1-10的烷氧基、碳原子數為2-10的鏈烯基、氟取代的碳原子數為2-10的鏈烯基、碳原子數為3-8的鏈烯氧基或氟取代的碳原子數為3-8的鏈烯氧基，且R₁₀、R₁₁所示基團中任意一個或多個CH₂可以被環戊基、環丁基或環丙基替代；W表示-O-、-S-或-CH₂O-。 The liquid crystal composition further comprises one or more compounds represented by formula VI

wherein R ₁₀ and R ₁₁ each independently represent an alkyl group having 1-10 carbon atoms, a fluorine-substituted alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, and a fluorine-substituted alkyl group. alkoxy with 1-10 carbon atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, alkenyl with 3-8 carbon atoms Alkenyloxy group with 3-8 carbon atoms substituted by oxy or fluorine, and any one or more CH _{2 in the groups represented by R 10} and R ₁₁ may be cyclopentyl, cyclobutyl or cyclopropyl Alternatively; W is represented by -O -, - S- or -CH ₂ O-.

其中，R₁₂表示碳原子數為1-5的烷基、碳原子數為2-5的鏈烯基；R₁₃表示F原子、碳原子數為1-5的烷基、碳原子數為1-5的烷氧基、碳原子數為2-5的鏈烯基，且R₁₂、R₁₃所示基團中任意一個或多個CH₂可以被環戊基、環丁基或環丙基替代；n表示0或1；(F)各自獨立地表示H或F。 The liquid crystal composition may further comprise one or more compounds represented by formula VII

Wherein, R ₁₂ represents an alkyl group with a carbon number of 1-5, an alkenyl group with a carbon number of 2-5; R ₁₃ represents a F atom, an alkyl group with a carbon number of 1-5, and a carbon number of 1 -5 alkoxy group, alkenyl group with 2-5 carbon atoms, and any one or more CH _{2 in the groups represented by R 12} and R ₁₃ may be replaced by cyclopentyl, cyclobutyl or cyclopropyl Substitute; n represents 0 or 1; (F) each independently represents H or F.

The liquid crystal display element of the present invention comprising the above-mentioned liquid crystal composition is an active matrix display element or a passive matrix display element.

Display elements can be TN, ECB, VA, IPS, FFS, PS-TN, PS-VA, PS-IPS, PS-FFS, PA-VA, PA-IPS, PA-FFS, PI-less VA, PI-less IPS, PI-less-FFS LCD mode.

The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited to the following embodiments. The methods are conventional methods unless otherwise specified. The raw materials can be obtained from open commercial sources unless otherwise specified.

The reaction process is generally monitored by TIC, and the post-processing of the reaction is generally water washing, extraction, drying after merging the organic phases, evaporation of the solvent under reduced pressure, recrystallization, and column chromatography. Either can implement the present invention according to the following description.

The percentages in this specification are mass percentages, and the temperature is in degrees Celsius (°C). The specific meanings and test conditions of other symbols are as follows: Cp represents the clear point of liquid crystal (°C), measured by DSC quantitative method; △n represents optical anisotropy, n _o ordinary light refractive index, n _e of the extraordinary light refractive index of the non-test conditions of 25 ± 2 ℃, 589nm, Abbe refractometer test; △ ε represents dielectric anisotropy, △ ε = ε _∥ -ε _⊥ , where ε _∥ is the dielectric constant parallel to the molecular axis, ε _⊥ is the dielectric constant perpendicular to the molecular axis, the test condition is 25 numbers, test ℃, 20 micron parallel box, INSTEC: ALCT-IR1 test; γ1 represents Rotational viscosity (mPa.s), test condition is 25±0.5℃, 20 micron parallel box, INSTEC: ALCT-IR1 test; Tr(%) means transmittance, Tr(%)=100%*brightness (Vop) brightness /Light source brightness, test equipment DMS501, test condition is 25±0.5℃, test box is 3.3 micron IPS test box, electrode spacing and electrode width are both 10 microns, friction direction and electrode angle are 10°, due to the _{existence of ε ⊥} and Tr There is a positive correlation, so when examining the transmittance, ε _⊥ can be used as an inspection index to prove it.

As used herein, the term "display element" can cover what is generally called a display device, a display device, and the like.

The structures of the liquid crystal monomers in the application examples of the present invention are represented by codes, and the code representation methods of the liquid crystal ring structures, end groups and connecting groups are shown in the following tables (1) and (2)

Example:

Comparative Example 1:

Comparative Example 2:

Example 1:

The liquid crystal composition was poured into the test box and tested to obtain: the transmittance of Comparative Example 1 was 5.4%, the transmittance of Comparative Example 2 was 5.3%, and the transmittance of Example 1 was 6%, compared with Comparative Example 1 and Comparative Example 2 That's an 11% and 13% increase, respectively.

Example 2:

Example 3:

Example 4:

Example 5:

Example 6:

Example 7:

Example 8:

Example 9:

Example 10:

Example 11:

Example 12:

The liquid crystal composition of the present invention has good stability to light and heat, low viscosity It can be adjusted to obtain a wider refractive index, a higher clear point (a wide range of operating temperature), and especially a higher light transmittance, so the display element has higher brightness or energy saving. effect of electricity.

Claims (9)

A liquid crystal composition comprising one or more compounds shown in formula I, one or more compounds shown in formula II and one or more compounds shown in formula III: wherein the one or more compounds shown in formula I are formulas I1 to I11, One or more compounds among the compounds represented by I13 and I14; the one or more compounds represented by the formula II are one or more compounds among the compounds represented by the formula II2 to II14; the one or more compounds represented by the formula III are the formula III2 to One or more of the compounds of III5:

Wherein, R ₁₁ and R ₃₁ each independently represent an alkyl group having 1-6 carbon atoms; R ₂₁ each independently represent an alkyl group having 1-5 carbon atoms; R ₅₁ and R ₆₁ each independently represent a carbon atom An alkyl group having 1-6 carbon atoms, an alkoxy group having 1-6 carbon atoms, an alkenyl group having 2-6 carbon atoms, or an alkenyloxy group having 3-6 carbon atoms. The liquid crystal composition according to claim 1, wherein the total mass percentage content of the one or more compounds represented by formula I is 1-40%, and the total mass percentage content of the one or more compounds represented by formula II is 1-40%, The total mass percentage content of the one or more compounds represented by formula III is 1-80%. The liquid crystal composition according to claim 1, further comprising one or more compounds represented by formula IV:

Wherein, R ₇ represents an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, and a fluorine-substituted alkyl group with 1 carbon atoms -10 alkoxy group, carbon number 2-10 alkenyl group, fluorine-substituted carbon number 2-10 alkenyl group, carbon number 3-8 alkenyl group or fluorine-substituted alkenyl group Alkenyloxy with 3-8 carbon atoms; and any one or more CH _{2 in the groups described in R 7} can be replaced by cyclopentyl, cyclobutyl or cyclopropyl;

,

,

independently represent:

,

,

,

,

,

,

and/or

One or more of; r represents 0, ₁ , 2 or 3; Z 1 and Z ₂ each independently represent a single bond, -CF ₂ O-, -CH ₂ CH ₂ - or -CH ₂ O-; Y ₂ represents F. Fluorine-substituted alkyl with 1-5 carbon atoms, fluorine-substituted alkoxy with 1-5 carbon atoms, fluorine-substituted alkenyl with 2-5 carbon atoms or fluorine-substituted carbon Alkenyloxy having 3-8 atoms. The liquid crystal composition according to claim 3, wherein the one or more compounds represented by formula IV are one or more of the compounds represented by IV0 to IV25:

Wherein, X ₁ and X ₂ each independently represent H or F; R ₇ each independently represents an alkyl group with 1-10 carbon atoms, a fluorine-substituted alkyl group with 1-10 carbon atoms, and a carbon number of 1-10 alkoxy, fluorine-substituted alkoxy with 1-10 carbon atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, carbon atoms, 3-8 carbon atoms, alkenyloxy group or fluorine-substituted 3-8 alkenyloxy group, and the group R ₇ as shown in any one or more of the CH ₂ groups may be cyclopentyl , cyclobutyl or cyclopropyl instead; (F) each independently represents H or F. The liquid crystal composition according to claim 1, further comprising one or more compounds represented by formula V:

wherein R ₈ and R ₉ each independently represent an alkyl group having 1-10 carbon atoms, fluorine, a fluorine-substituted alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, Fluorine-substituted alkoxy with 1-10 carbon atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and 3-8 carbon atoms Alkenyloxy or fluorine-substituted alkenyloxy with 3-8 carbon atoms, and any one or more CH _{2 in the groups represented by R 8} and R ₉ may be cyclopentyl, cyclobutyl or cyclopentyl propyl group is replaced; Z ₃ and Z ₄ each independently represent a single bond, -CH ₂ CH ₂ - or CH ₂ O-;

,

represent independently

,

,

,

,

,

,

and/or

One or more of; m represents 1, 2 or 3; n represents 0 or 1. The liquid crystal composition according to claim 5, wherein the one or more compounds represented by formula V are one or more of the compounds represented by V1 to V11:

wherein R ₈ and R ₉ each independently represent an alkyl group having 1-10 carbon atoms, fluorine, a fluorine-substituted alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, Fluorine-substituted alkoxy with 1-10 carbon atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, and 3-8 carbon atoms Alkenyloxy or fluorine-substituted alkenyloxy with 3-8 carbon atoms, and any one or more CH _{2 in the groups represented by R 8} and R ₉ may be cyclopentyl, cyclobutyl or cyclopentyl Propyl substitution. The liquid crystal composition according to claim 1, further comprising one or more compounds represented by formula VI:

wherein R ₁₀ and R ₁₁ each independently represent an alkyl group having 1-10 carbon atoms, a fluorine-substituted alkyl group having 1-10 carbon atoms, an alkoxy group having 1-10 carbon atoms, and a fluorine-substituted alkyl group. alkoxy with 1-10 carbon atoms, alkenyl with 2-10 carbon atoms, fluorine-substituted alkenyl with 2-10 carbon atoms, alkenyl with 3-8 carbon atoms Alkenyloxy group with 3-8 carbon atoms substituted by oxy or fluorine, and any one or more CH _{2 in the groups represented by R 10} and R ₁₁ may be cyclopentyl, cyclobutyl or cyclopropyl Alternatively; W is represented by -O -, - S- or -CH ₂ O-. According to the liquid crystal composition of claim 1, it may further comprise one or more compounds represented by formula VII:

Wherein, R ₁₂ represents an alkyl group with a carbon number of 1-5, an alkenyl group with a carbon number of 2-5; R ₁₃ represents a F atom, an alkyl group with a carbon number of 1-5, and a carbon number of 1 -5 alkoxy group, alkenyl group with 2-5 carbon atoms, and any one or more CH _{2 in the groups represented by R 12} and R ₁₃ may be replaced by cyclopentyl, cyclobutyl or cyclopropyl Substitute; n represents 0 or 1; (F) each independently represents H or F. A liquid crystal display element comprising the liquid crystal composition according to any one of claims 1 to 8, which is an active matrix display element or a passive matrix display element.